Mueller, who remained quiet throughout his investigation, will be grilled by members of the House Judiciary and Intelligence committees on Wednesday about the findings laid out in his lengthy report.

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Given Mueller’s insistence that he will speak only about matters within the four corners of his report, Democrats are expected to focus heavily on the details in his document including the contacts between the Trump campaign and Russia and the evidence of potential obstruction of justice Mueller lays out.

Here are some key statistics from Mueller’s report as Washington braces for his public testimony:

9: Mueller’s first and only public remarks about his investigation’s findings in late May lasted roughly nine minutes.

11: Mueller examined 11 episodes in which Trump may have obstructed the FBI’s original investigation into Russian interference or the special counsel’s investigation itself. One episode that has attracted particular scrutiny was the president’s attempts to have then-White House counsel Don McGahn remove Mueller as special counsel.

13: Mueller made 13 requests to foreign governments under mutual legal assistance treaties, deals in which two countries agree to share evidence and relevant information tied to criminal and other related matters.

14: Mueller uncovered other possible criminal activity outside the scope of his original mandate and referred 14 such instances to other Justice Department offices for investigation. Two of those are known — the investigations that spurred charges against former Trump attorney Michael Cohen and former Obama-era White House counsel Greg Craig — but the rest remain redacted in the public report.

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19: Mueller assembled a team that included 19 prosecutors at the high point of his investigation. Five of the prosecutors, including Mueller, joined the special counsel’s office from the private sector and 14 were on detail from the Justice Department.

37: Mueller charged 37 individuals and entities throughout his investigation, including 13 Russian nationals and three Russian entities for their role in powering a St. Petersburg troll farm that spread disinformation and 12 Russian intelligence officers for conducting cyberattacks against Democrats and electoral infrastructure.

40: The FBI assigned 40 officials to work alongside Mueller’s investigators, a group that included agents, intelligence analysts, forensic accountants, a paralegal and other professional staff.

50: The special counsel’s office obtained nearly 50 orders authorizing the use of pen registers, devices that record the phone numbers called from a particular phone line.

230: The investigators obtained more than 230 communications records orders through a federal statute.

448: Mueller’s lengthy report spans 448 pages, including two nearly 200-page volumes and a number of appendices.

500: The investigative team interviewed approximately 500 witnesses as part of its investigation, of which 80 witnesses testified before the grand jury. The special counsel’s office also conducted nearly 500 search-and-seizure warrants.